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https://issues.apache.org/jira/browse/HDFS-9198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15121147#comment-15121147
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Vinayakumar B commented on HDFS-9198:
-------------------------------------

[~daryn], Is it worth merging this to 2.7.3?

> Coalesce IBR processing in the NN
> ---------------------------------
>
>                 Key: HDFS-9198
>                 URL: https://issues.apache.org/jira/browse/HDFS-9198
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 2.8.0
>
>         Attachments: HDFS-9198-Branch-2-withamend.diff, 
> HDFS-9198-Branch-2.8-withamend.diff, HDFS-9198-branch2.patch, 
> HDFS-9198-trunk.patch, HDFS-9198-trunk.patch, HDFS-9198-trunk.patch, 
> HDFS-9198-trunk.patch, HDFS-9198-trunk.patch
>
>
> IBRs from thousands of DNs under load will degrade NN performance due to 
> excessive write-lock contention from multiple IPC handler threads.  The IBR 
> processing is quick, so the lock contention may be reduced by coalescing 
> multiple IBRs into a single write-lock transaction.  The handlers will also 
> be freed up faster for other operations.



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